问题详情

Which of the following statements is CORRECT？

A．If there are no restrictions, try to get as big a response as you can.

B．Always control the number of respondents in case it gets out of control.

C．If time is limited, try to pick out the respondents in advance.

D．Finish the planned number of interviews even if the deadline should be postponed.

请帮忙给出正确答案和分析，谢谢！